Scientists discovered that this enhancer associated with hair color has a binding site for a particular transcription factor. one form of the binding site has the sequence cactaaag and is associated with dark hair, and the other form of the binding site has the nearly identical sequence cgctaag and is associated with blond hair. how could these two nearly identical enhancer binding sites lead to different rates of initiating transcription of the regulated gene?

Homeodomain a conserved sequence of 60 amino acids used in the binding to DNA. Usually found in transcription factors, it is used to express genes that are related, more specifically in development to the make tissues associated with one another. 

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.